October 2022 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9452] MASTER OT J001204.00-412337.4: 7th rebrightening
by Taichi Kato 12 Oct '22

12 Oct '22

MASTER OT J001204.00-412337.4: 7th rebrightening Josch Hambsch detected another rebrightening on Oct. 10 (16.2 mag). The object had been rising before this rebrightening.

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[vsnet-newvar 9451] Swift J1913.1+1946
by Taichi Kato 10 Oct '22

10 Oct '22

Swift J1913.1+1946 16.6-mag X-ray transient. ATEL #15650 ATEL #15650 Title: Swift J1913.1+1946 a new bright hard X-ray and optical transient Author: S. Dichiara (PSU), J. D. Gropp (PSU), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (U Tampa), F. E. Marshall (NASA/GSFC), A. Tohuvavohu (U Toronto) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team Queries: jak51(a)psu.edu Posted: 9 Oct 2022; 14:44 UT Subjects:Optical, X-ray, Transient At 2022-10-09 14:10:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located the new transient Swift J1913.1+1946 (triggers=1126853 and 1126854). Swift slewed immediately to the location. The BAT on-board calculated location is RA, Dec 288.263, +19.803 which is RA(J2000) = 19h 13m 03s Dec(J2000) = +19d 48' 09" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). After slewing, the source was still visible (leading to the second trigger). The XRT began observing the field at 14:13:30 UT, 143 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 288.2643, 19.7712 which is equivalent to: RA(J2000) = 19h 13m 3.43s Dec(J2000) = +19d 46' 16.3" with an uncertainty of 5.6 arcseconds (radius, 90% containment). This location is 1.9 arc minutes from the BAT onboard position, within the BAT error circle. UVOT took a finding chart exposure of 150 seconds with the White filter starting 179 seconds after the BAT trigger. There is a candidate counterpart in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 19:13:03.48 = 288.26452 DEC(J2000) = +19:46:24.6 = 19.77350 with a 90%-confidence error radius of about 0.61 arc sec. This position is 8.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.63 with a 1-sigma error of about 0.14. No correction has been made for the large, but uncertain, extinction expected.

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[vsnet-newvar 9450] ASASSN-21cw likely superoutburst
by Taichi Kato 09 Oct '22

09 Oct '22

ASASSN-21cw likely superoutburst YYYYMMDD(UT) mag observer 20220924.1525 14.835zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.2318 15.133zg (ZTF Alert DC mag (Masci+ 2019)) 20220928.1463 15.229zr (ZTF Alert DC mag (Masci+ 2019)) 20220928.1503 15.574zg (ZTF Alert DC mag (Masci+ 2019)) 20220930.1538 15.691zg (ZTF Alert DC mag (Masci+ 2019)) 20220930.1721 15.321zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.1749 15.537zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.2403 16.130zg (ZTF Alert DC mag (Masci+ 2019)) 20221006.1620 16.504zg (ZTF Alert DC mag (Masci+ 2019)) 20221006.1850 15.700zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9449] ASASSN-22mr: new WZ Sge-type dwarf nova
by Taichi Kato 09 Oct '22

09 Oct '22

ASASSN-22mr: new WZ Sge-type dwarf nova Berto Monard and Josch Hambsch have reported observations. The data show clear double-humped superhumps with a period of 0.0534(2) d (full amplitude 0.14 mag). 224117.532 -675916.24 (2000.0) Gaia_DR2_6385763697885620480 plx=3.080(0.730) dismod=7.6 pmra=7.201(1.050) pmdec=-1.210(1.120) G=20.444 BP=20.502 RP=20.160 224117.533 -675916.24 (2000.0) Gaia_EDR3_6385763697885620480 plx=2.711(0.552) dismod=7.8 pmra=6.612(0.477) pmdec=1.564(0.553) G=20.396 BP=20.299 RP=20.190 224117.459 -675916.64 (2000.0) GALEX_DR5_6384250644318917360 NUV=20.810(0.146) FUV=20.940(0.242)

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[vsnet-newvar 9448] N080829A possible superoutburst
by Taichi Kato 08 Oct '22

08 Oct '22

N080829A possible superoutburst YYYYMMDD(UT) mag observer 20221003.5749 <155c (Yutaka Maeda) 20221005.2237 16.157zr (ZTF Alert DC mag (Masci+ 2019)) 20221005.2537 15.867zg (ZTF Alert DC mag (Masci+ 2019)) 20221005.5678 <156c (Yutaka Maeda)

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[vsnet-newvar 9447] SDSS J001153.08-064739.1: most likely SU UMa star
by Taichi Kato 08 Oct '22

08 Oct '22

SDSS J001153.08-064739.1: most likely SU UMa star Josch Hambsch has recored a 0.2 mag hump. Although the baseline is one orbital cycle, the profile and amplitude suggest a superhump. This object is very interesting since it is in the period gap and has an evolved secondary. The reported mass ratio is above 0.25 and the detection of superhumps is great astrophysical importance. Continued observations are encouraged.

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[vsnet-newvar 9446] ASASSN-21gw superoutburst
by Taichi Kato 07 Oct '22

07 Oct '22

ASASSN-21gw superoutburst Superhumps were detected in 2021 May. YYYYMMDD(UT) mag observer 20220927.5026 15.264zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.4416 15.540zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9445] ASASSN-20bb likely superoutburst
by Taichi Kato 07 Oct '22

07 Oct '22

ASASSN-20bb likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20221004.4536 16.524zg (ZTF Alert DC mag (Masci+ 2019)) 20221004.4541 16.532zg (ZTF Alert DC mag (Masci+ 2019)) 20221004.4819 16.798zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.4824 16.799zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9444] 1RXS J185310.0+594509 superoutburst
by Taichi Kato 06 Oct '22

06 Oct '22

1RXS J185310.0+594509 superoutburst YYYYMMDD(UT) mag observer 20220923.2220 18.685zg (ZTF Alert DC mag (Masci+ 2019)) 20220925.1568 18.605zg (ZTF Alert DC mag (Masci+ 2019)) 20220927.1984 18.451zg (ZTF Alert DC mag (Masci+ 2019)) 20220927.6203 <156C (Masayuki Moriyama) 20220929.1309 18.315zr (ZTF Alert DC mag (Masci+ 2019)) 20220929.1967 18.459zg (ZTF Alert DC mag (Masci+ 2019)) 20220929.494 172C (Mitsutaka Hiraga) 20220929.5232 <158c (Yutaka Maeda) 20220930.437 147C (Mitsutaka Hiraga) 20220930.6429 147C (Masayuki Moriyama) 20221001.6098 148C (Masayuki Moriyama) 20221003.485 155C (Mitsutaka Hiraga) 20221003.6404 152C (Masayuki Moriyama) 20221005.5012 153C (Masayuki Moriyama)

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[vsnet-newvar 9443] SDSS J001153.08-064739.1 rare bright outburst
by Taichi Kato 06 Oct '22

06 Oct '22

SDSS J001153.08-064739.1 rare bright outburst Moriyama-san has pointed out that this object is undergoing a rare bright outburst. The orbital period is in the period gap and a superoutburst can be expected. https://ui.adsabs.harvard.edu/abs/2014ApJ...790...28R/abstract Using ZTF data, I obtained an orbital period of 0.1002809(1) d. The phased light curve show clear EW-like modulations with an amplitude of 0.25 mag. YYYYMMDD(UT) mag observer 20220703.4593 17.813zg (Zwicky Transient Facility (Masci et al., 2019)) 20220706.4376 17.765zg (Zwicky Transient Facility (Masci et al., 2019)) 20220917.3159 17.539zg (ZTF Alert DC mag (Masci+ 2019)) 20220929.2732 14.095zg (ZTF Alert DC mag (Masci+ 2019)) 20221003.6523 13.10C (Masayuki Moriyama) 20221005.5858 13.51C (Masayuki Moriyama)

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vsnet-newvar October 2022